A privilege—etymologically "private law" or law relating to a specific individual—is a special right or immunity granted by a government to a restricted group, either by birth or on a conditional basis. A privilege can be revoked in some cases. In modern democracies, a 'privilege' is conditional and granted only after birth. By contrast, a 'right' is an inherent, irrevocable entitlement held by all citizens or all humanity from birth.

Under common law, privilege is a term describing a number of rules excluding evidence that would be adverse to a fundamental principle or relationship if it were disclosed.[1] The most common form is Solicitor-client privilege (attorney-client privilege under US law, and has been renamed client legal privilege in Australia). This protects confidential communications between a client and his legal adviser for the dominant purpose of legal advice.[2] The rationale is that clients ought to be able to communicate freely with their lawyers, in order to facilitate the proper functioning of the legal system. Other common forms include privilege against self incrimination (in other proceedings), without prejudice privilege (protecting communications made in the course of negotiations to settle a legal dispute), public interest privilege (formerly Crown privilege, protecting documents necessary for the proper functioning of government), marital privilege and medical professional privilege. Many other miscellaneous privileges also exist. For example, the old common law privilege to title deeds may still exist, though of little relevance today.[3]

In a broader sense, 'privilege' can refer to special powers or 'de facto' immunities held as a consequence of political power or wealth. Privilege of this sort may be transmitted by birth into a privileged class or achieved through individual actions. Compare elite.